I would see if they offer a little bigger dish on those pistons,to drop the compression some.You could probably make the motor run at 10.1 :1 with the 268 cam,but the tune had better be perfect ,if not KABOOOOOM!!!!If you plan to ever drive that outa state you better bring your own gas ,because that motor would never run on cali pump gas. The 268 cam is perfect for your motor ,other than the compression and the cheapest and best way to lower the compression would be a bigger dish on the piston.
The balls in your court now,try to "maybe" be able to run it on pump premium or know that it will run on regular pump gas anywhere you go.By the way ,massive goverment emissions laws have already been passed and go into effect in 2009,look for 87 octane to be pump premium,we are at 91 max octane here in cali already ,before the laws go into effect!!!